Ship project history: Built as government yacht, officially
was classified as aviso, also was used as HQ, training and target ship (in the latter case
for aviation torpedoes trials). Grille had easily recognised "yacht" outline profile with
bowsprit and experimental machinery: she was the first ship with high-pressure
boilers of Benson design (80atm). With war beginning Grillewas converted to auxiliary minelayer, but then
used mainly as a command ship.